1325639501 has 2 divisors, whose sum is σ = 1325639502. Its totient is φ = 1325639500.

The previous prime is 1325639473. The next prime is 1325639521. The reversal of 1325639501 is 1059365231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 887742025 + 437897476 = 29795^2 + 20926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325639501 - 2¹⁰ = 1325638477 is a prime.

It is a super-2 number, since 2×1325639501² = 3514640173223058002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1325639521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662819750 + 662819751.

It is an arithmetic number, because the mean of its divisors is an integer number (662819751).

Almost surely, 2^1325639501 is an apocalyptic number.

It is an amenable number.

1325639501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325639501 is an equidigital number, since it uses as much as digits as its factorization.

1325639501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 1325639501 is about 36409.3326085497. The cubic root of 1325639501 is about 1098.5212916045.

The spelling of 1325639501 in words is "one billion, three hundred twenty-five million, six hundred thirty-nine thousand, five hundred one".